Reverse Monte Carlo Algorithm and Maximum Entropy Principle for the Analysis of Positive Muon Spin Rotation and Relaxation Spectra

Maisuradze, A.; Yaouanc, A.; Réotier, P. Dalmas de

doi:10.7566/jpscp.21.011053

Cited by 3 publications

(3 citation statements)

References 31 publications

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“…Figure 3 displays the distributions corresponding to the asymmetry spectra. Such distributions are computed from the measured asymmetry spectra using the reverse Monte Carlo technique supplemented with the maximum entropy requirement [22,23]. The overall shape of the distributions remains similar for all the distributions while they are clearly shifted towards low field when the temperature increases: this is a direct measurement of the temperature dependence of m.…”

Section: Resultsmentioning

confidence: 99%

Dual nature of magnetism in MnSi

Yaouanc

Réotier

Roessli

et al. 2020

Phys. Rev. Research

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The temperature dependence of the manganese magnetic moment and the spin-lattice relaxation rate measured by the muon spin relaxation technique in the magnetically ordered phase of the chiral intermetallic cubic MnSi system are both explained in terms of helimagnon excitations of a localized spin model. The two free parameters characterizing the helimagnon dispersion relation are determined. A combined analysis of the two data sets cannot be achieved using the self-consistent renormalization theory of spin fluctuations which assumes the magnetism of MnSi to arise uniquely from electronic bands. As a result of this work, MnSi is proposed to be a dual electronic system composed of localized and itinerant magnetic electrons. Finally we note that the analysis framework can be applied to other helimagnets such as the magnetoelectric compound Cu2OSeO3.

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Section: Resultsmentioning

confidence: 99%

Dual nature of magnetism in MnSi

Yaouanc

Réotier

Roessli

et al. 2020

Phys. Rev. Research

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“…This is a model-free fit to the data, recently developed and exposed in Refs. [19,20]. In parallel, the physical model which we have evoked above and which is fully explained in Ref.…”

Section: Specimen Dependence Of the Zero-field Spectrummentioning

confidence: 79%

“…Because of the high statistic of the spectrum and the absence of strong damping, the results are similar. It is not always the case [20].…”

Section: Specimen Dependence Of the Zero-field Spectrummentioning

confidence: 99%

On the Robustness of the MnSi Magnetic Structure Determined by Muon Spin Rotation

Réotier

Yaouanc

Amato

et al. 2018

QuBS

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Muon spin rotation (µSR) spectra recorded for manganese silicide MnSi and interpreted in terms of a quantitative analysis constrained by symmetry arguments were recently published. The magnetic structures of MnSi in zero-field at low temperature and in the conical phase near the magnetic phase transition were shown to substantially deviate from the expected helical and conical structures. Here, we present material backing the previous results obtained in zero-field. First, from simulations of the field distributions experienced by the muons as a function of relevant parameters, we confirm the uniqueness of the initial interpretation and illustrate the remarkable complementarity of neutron scattering and µSR for the MnSi magnetic structure determination. Second, we present the result of a µSR experiment performed on MnSi crystallites grown in a Zn-flux and compare it with the previous data recorded with a crystal obtained from Czochralski pulling. We find the magnetic structure for the two types of crystals to be identical within experimental uncertainties. We finally address the question of a possible muon-induced effect by presenting transverse field µSR spectra recorded in a wide range of temperature and field intensity. The field distribution parameters perfectly scale with the macroscopic magnetization, ruling out a muon-induced effect.

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Antiferromagnetic Correlations in Strongly Valence Fluctuating CeIrSn

et al. 2021

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CeIrSn with a quasikagome Ce lattice in the hexagonal basal plane is a strongly valence fluctuating compound, as we confirm by hard x-ray photoelectron spectroscopy and inelastic neutron scattering, with a high Kondo temperature of T K ∼ 480 K. We report a negative in-plane thermal expansion α=T below 2 K, which passes through a broad minimum near 0.75 K. Volume and a-axis magnetostriction for Bka are markedly negative at low fields and change sign before a sharp metamagnetic anomaly at 6 T. These behaviors are unexpected for Ce-based intermediate valence systems, which should feature positive expansivity. Rather they point towards antiferromagnetic correlations at very low temperatures. This is supported by muon spin relaxation measurements down to 0.1 K, which provide microscopic evidence for a broad distribution of internal magnetic fields. Comparison with isostructural CeRhSn suggests that these antiferromagnetic correlations emerging at T ≪ T K result from geometrical frustration.

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Reverse Monte Carlo Algorithm and Maximum Entropy Principle for the Analysis of Positive Muon Spin Rotation and Relaxation Spectra

Cited by 3 publications

References 31 publications

Dual nature of magnetism in MnSi

Dual nature of magnetism in MnSi

On the Robustness of the MnSi Magnetic Structure Determined by Muon Spin Rotation

Antiferromagnetic Correlations in Strongly Valence Fluctuating CeIrSn

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